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<dc:title xml:lang="fr">Interaction du peptide beta amyloïde avec les membranes plasmiques cellulaires</dc:title>
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<dc:subject xml:lang="fr">Maladie d’Alzheimer</dc:subject>
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<dcterms:abstract xml:lang="fr">La maladie d’Alzheimer (MA) est une maladie neurodégénérative du système nerveux central qui se caractérise notamment par l’accumulation de peptide beta-amyloïde (Aβ) dans le tissus nerveux. Dans la première partie de cette thèse nous avons montré que l’interaction des oligomères Aβ1-42 de haut poids moléculaire avec la membrane plasmique des cellules PC12 différenciées ou des cellules nerveuses (neurones et astrocytes primaires) provoque des variations de la [Ca2+]i dépendant de l’activation des récepteurs NMDA. Dans la seconde partie nous avons montré qu’une pré-exposition des cellules PC12 et des cellules nerveuses à de faibles concentrations de peptide Aβ module l’interaction ultérieure des oligomères avec la membrane plasmique. Enfin dans le cadre d’une collaboration avec l’entreprise Innovative Health Diagnostics (IHD) nous avons participé à la caractérisation d’une sonde amyloïde fluorescente développée pour réaliser des tests de détection de la MA à partir d’échantillons sanguins.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Alzheimer’s disease (AD) is a neurodegenerative disease of the central nervous system which is characterized in particular by the accumulation of beta amyloïde peptide (Aβ) in nerve tissues. In the first part of this thesis we showed that the interaction of high molecular weight Aβ1-42 oligomers with the plasma membrane of differenciated PC12 or nerve cells (neurons and astrocytes) triggers variations of their depending on the activation of the NMDA receptors. In the second part we showed that a pre-exposure of PC12 and nerve cells with low concentrations Aβ1-42 of modulates the later interaction of oligomers with the plasma membrane. Finally in collaboration with the company Innovative Health Diagnostics (IHD) we participated in the characterization of a fluorescent amyloid probe developed to realize detection test of AD from blood samples.</dcterms:abstract>
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